Classification
330 - Economics
2
333 - Economics of land & energy
2
380 - Commerce, communications & transportation
630 - Agriculture & related technologies
320 - Political science
1
340 - Law
1
363 - Other social problems & services
1
576 - Genetics & evolution
1
581 - Specific topics in natural history
1
700 - The arts; fine & decorative arts
1
720 - Architecture
1